CORD-1244 Remove unnecessary imports

Change-Id: Ic7945008d9b46fd5de9664f26e47d4b973aeb8d4
diff --git a/xos/attic/header.py b/xos/attic/header.py
index 7ecc68a..52c77de 100644
--- a/xos/attic/header.py
+++ b/xos/attic/header.py
@@ -7,9 +7,6 @@
 from django.forms.models import model_to_dict
 from django.db.models import Q
 from operator import itemgetter, attrgetter, methodcaller
-from core.models import Tag
-from core.models.service import LeastLoadedNodeScheduler
-from services.vrouter.models import VRouterService, VRouterTenant
 import traceback
 from xos.exceptions import *
 from xos.config import Config